High fidelity speaker enclosure



w. H. QUINION 3,235,028 HIGH FIDELITY SPEAKER ENCLOSURE Filed Feb. 25.1965 Feb. 15, 1966 if /Z6 zfl Z0 I N VE N TOR.

Vic 4464M H, yam Y0 United States Patent HIGH FIDELITY SPEAKER ENCLOSUREWilliam H. Quinion, Ghent St., Mellenville, N.Y. Substituted forabandoned application Ser. No. 212,190, July 25, 1962. This applicationFeb. 25, 1965, Ser- 2 Claims. (Cl. 181-31) My invention is directedtoward high fidelity loudspeaker enclosures. My application is asubstitute application filed July 25, 1962, Serial No. 212,190, newabandoned.

It is an object of my invention to provide a new and improvedloudspeaker enclosure suitable for high fidelity reproduction.

Another object is to provide a new and improved loudspeaker enclosurefor reinforcing the bass notes produced at the front of the loudspeaker.

Still another object is to provide a new and improved loudspeakerenclosure of the character indicated, which can be easily manufacturedat low cost.

All of the foregoing and still further objects and advantages of myinvention will be explained with reference both to this specificationand to the drawings, wherein:

FIGURE 1 is a perspective view of my invention;

FIGURE 2 is a top plan view;

FIGURE 3 is a side -view;

FIGURE 4 is a front view; and

FIGURE 5 is a cross-section through 5-5 of FIG- URE 4.

Referring now to the drawings, my enclosure has a top exterior panel 10,a bottom exterior panel 12, side exterior panels 14 and 16, a rearexterior panel 18, and an open front periphery 20.

An exposed interior panel 22 makes an angle A with respect to periphery20. Panel 22 has a central opening 24 arranged to support a loudspeaker26, the front of the speaker cone 28 communicating with opening 24.Speaker 26 is, for example, a two-terminal permanent magnet speaker.

A second interior panel 30 extends from panel 14 and is parallel topanel 22.

A third interior panel 32 extends from the intersection of panels 14 and18, and is also parallel to panel 22.

A fourth interior panel 34 extends between panels 18 and 16, and makesan angle C with respect to a plane parallel to periphery 20.

A fifth interior panel 36 extends from the edge 38 of panel 22 remotefrom panel 14, at an angle B with respect to the extension of panels 36and 16, thus defining a port 40.

Panels 36 and 32 serve as primary and secondary sound directors to guidethe sound waves emitted from the rear of speaker 26, and at the sametime, filter out the high frequencies. The guided waves are mixedtogether at panel 30 and then are directed by panel 34 into port 40 withsuch phase as to reinforce the sound waves emitted from the front of thespeaker cone 28. This enclosure thus produces a depth of sound whichprovides truer sound reproduction at any listening level.

If M is the thickness in inches of each panel, and X is the width ofpanel 22 in inches, then panel 36 is 2X 3 inches wide, panel 32 is 5X/8inches wide, panel 30 is X 8 inches wide, and panel 34 is 5X/ 12 incheswide.

3,235,028 Patented F eb'. 15, 1966 The height of the interior panels is3X/22M. X depends upon the size of the speaker cone. If the speakerdiameter is D, then X=3D/2. Thus when D=10 inches, X: 15 inches.

Angle A is equal to one-half the angle the speaker cone makes with theface of the speaker. The cone angle is normally 30, so angle A isnormally 15. Angle B git: be, for example, 15. Angle C can be forexample The separation between panel 30 and the front edge of thecabinet is equal to D, the speaker diameter.

The width of port 40 also depends upon the speaker size. Moreparticularly, this width is equal to D/X where D and X have beenpreviously defined.

While I have described my invention with particular reference to thedrawings, my protection is to be limited only by the terms of the claimswhich follow.

Having thus described my invention, I claim as new and desire to secureby Letters Patent:

1. A loudspeaker enclosure comprising, top, back, side and bottom panelsforming a rectangular enclosure having an open vertical front, and afirst interior vertical panel mounted adjacent said front, and inclinedat a predetermined angle with respect to the vertical front side, saidfirst interior panel having a central opening of predetermineddimension, with a loudspeaker mounted in said opening, and having aspeaker cone with a predetermined cone angle having a width bearing aspecific predetermined ratio to the first interior panel, second andthird interior panels having widths of specific predetermined ratios tothe first interior panel, and wherein the second and third interiorpanels are both parallel to the first interior panel, further includinga fourth interior panel joining a back and side panel at a predeterminedangle, and having a width bearing a specific predetermined ratio to thefirst interior panel, and a fifth interior panel extending inwardly fromthe point of intersection from the first interior panel and the frontplane at a predetermined angle to said side panel, and spaced from saidside panel, providing a port of predetermined dimension, and wherein theheight of all the said panels is a predetermined dimension expressed ina linear algebraic relationship involving the-width of the firstinterior panel and the thickness of each panel. a

2. A loudspeaker enclosure, as in claim 1, wherein the width of the saidport is equal to the diameter of the speaker, divided by the width ofthe first interior panel, and wherein the second interior panel is /athe width of the first interior panel, and the third interior panel isthe width of the first interior panel, and the fourth interior panel is5 the width of the first interior panel, and the fifth interior panel is/3 the width of the first interior panel, and wherein the angle formedbetween the first interior panel and the front plane is /2 the angle ofthe speaker cone.

References Cited by the Examiner UNITED STATES PATENTS 2,160,283 5/ 1939Roberts 181-31 2,866,513 12/1958 White 18131 3,131,783 5/1964 Maresl8131 LEO SMILOW, Primary Examiner.

S. I. TOMSKY,Assistant Examiner.

1. A LOUDSPEAKER ENCLOSURE COMPRISING, TOP, BACK, SIDE AND BOTTOM PANELSFORMING A RECTANGULAR ENCLOSURE HAVING AN OPEN VERTICAL FRONT, AND AFIRST INTERIOR VERTICAL PANEL MOUNTED ADJACENT SAID FRONT, AND INCLINEDAT A PREDETERMINED ANGLE WITH RESPECT TO THE VERTICAL FRONT SIDE, SAIDFIRST INTERIOR PANEL HAVING A CENTRAL OPENING OF PREDETERMINEDDIMENSION, WITH A LOUDSPEAKER MOUNTED IN SAID OPENING, AND HAVING ASPEAKER CONE WITH A PREDETERMINED CONE ANGLE HAVING A WIDTH BEARING ASPECIFIC PREDETERMINED RATIO TO THE FIRST INTERIOR PANEL, SECOND ANDTHIRD INTERIOR PANELS HAVING WIDTHS OF SPECIFIC PREDETERMINED RATIOS TOTHE FIRST INTERIOR PANEL, AND WHEREIN THE SECOND AND THIRD INTERIORPANELS ARE BOTH PARALLEL TO THE FIRST INTERIOR PANEL, FURTHER INCLUDINGA FOURTH INTERIOR PANEL JOINING A BACK AND SIDE PANEL AT A PREDETERMINEDANGLE, AND HAVING A WIDTH BEARING A SPECIFIC PREDETERMINED RATIO TO THEFIRST INTERIOR PANEL, AND A FIFTH INTERIOR PANEL EXTENDING INWARDLY FROMTHE POINT OF INTERSECTION FROM THE FIRST INTERIOR PANEL AND THE FRONTPLANE AT A PREDETERMINED ANGLE TO SAID SIDE PANEL, AND SPACED FROM SAIDSIDE PANEL, PROVIDING A PORT OF PREDETERMINED DIMENSION, AND WHEREIN THEHEIGHT OF ALL THE SAID PANELS IS A PREDETERMINED DIMENSION EXPRESSED INA LINEAR ALGEBRAIC RELATIONSHIP INVOLVING THE WIDTH OF THE FIRSTINTERIOR PANEL AND THE THICKNESS OF EACH PANEL.